What causes blackheads?

Hello! I'm a woman in my early 30s.

Causes of blackheads What could it be?

My skin is white and looks good from afar.

My husband or close friends who see my face up close

I was surprised that my makeup came off more than I thought and my pores and blackheads were clearly visible.

so Causes of blackheads I wanted to know what it was ㅠㅠ

Even with makeup, it can be covered to some extent

If you don't do it thoroughly, the blackheads will stand out and be more noticeable... haha

so Causes of blackheads I want to reduce it on my own!

I like sharing information on home care/treatment/diet habits.